linux/drivers/media/dvb-core/dvb_demux.h

/*
 * dvb_demux.h: DVB kernel demux API
 *
 * Copyright (C) 2000-2001 Marcus Metzler & Ralph Metzler
 *                         for convergence integrated media GmbH
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#ifndef _DVB_DEMUX_H_
#define _DVB_DEMUX_H_

#include <linux/time.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>

#include "demux.h"

/**
 * enum dvb_dmx_filter_type - type of demux feed.
 *
 * @DMX_TYPE_TS:	feed is in TS mode.
 * @DMX_TYPE_SEC:	feed is in Section mode.
 */
enum dvb_dmx_filter_type {
	DMX_TYPE_TS,
	DMX_TYPE_SEC,
};

/**
 * enum dvb_dmx_state - state machine for a demux filter.
 *
 * @DMX_STATE_FREE:		indicates that the filter is freed.
 * @DMX_STATE_ALLOCATED:	indicates that the filter was allocated
 *				to be used.
 * @DMX_STATE_READY:		indicates that the filter is ready
 *				to be used.
 * @DMX_STATE_GO:		indicates that the filter is running.
 */
enum dvb_dmx_state {
	DMX_STATE_FREE,
	DMX_STATE_ALLOCATED,
	DMX_STATE_READY,
	DMX_STATE_GO,
};

#define DVB_DEMUX_MASK_MAX 18

#define MAX_PID 0x1fff

#define SPEED_PKTS_INTERVAL 50000

/**
 * struct dvb_demux_filter - Describes a DVB demux section filter.
 *
 * @filter:		Section filter as defined by &struct dmx_section_filter.
 * @maskandmode:	logical ``and`` bit mask.
 * @maskandnotmode:	logical ``and not`` bit mask.
 * @doneq:		flag that indicates when a filter is ready.
 * @next:		pointer to the next section filter.
 * @feed:		&struct dvb_demux_feed pointer.
 * @index:		index of the used demux filter.
 * @state:		state of the filter as described by &enum dvb_dmx_state.
 * @type:		type of the filter as described
 *			by &enum dvb_dmx_filter_type.
 */

struct dvb_demux_filter {
	struct dmx_section_filter filter;
	u8 maskandmode[DMX_MAX_FILTER_SIZE];
	u8 maskandnotmode[DMX_MAX_FILTER_SIZE];
	bool doneq;

	struct dvb_demux_filter *next;
	struct dvb_demux_feed *feed;
	int index;
	enum dvb_dmx_state state;
	enum dvb_dmx_filter_type type;

	/* private: used only by av7110 */
	u16 hw_handle;
};

/**
 * struct dvb_demux_feed - describes a DVB field
 *
 * @feed:	a digital TV feed. It can either be a TS or a section feed:
 *		if the feed is TS, it contains &struct dvb_ts_feed @ts;
 *		if the feed is section, it contains
 *		&struct dmx_section_feed @sec.
 * @cb:		digital TV callbacks. depending on the feed type, it can be:
 *		if the feed is TS, it contains a dmx_ts_cb() @ts callback;
 *		if the feed is section, it contains a dmx_section_cb() @sec
 * 		callback.
 *
 * @demux:	pointer to &struct dvb_demux.
 * @priv:	private data that can optionally be used by a DVB driver.
 * @type:	type of the filter, as defined by &enum dvb_dmx_filter_type.
 * @state:	state of the filter as defined by &enum dvb_dmx_state.
 * @pid:	PID to be filtered.
 * @timeout:	feed timeout.
 * @filter:	pointer to &struct dvb_demux_filter.
 * @ts_type:	type of TS, as defined by &enum ts_filter_type.
 * @pes_type:	type of PES, as defined by &enum dmx_ts_pes.
 * @cc:		MPEG-TS packet continuity counter
 * @pusi_seen:	if true, indicates that a discontinuity was detected.
 *		it is used to prevent feeding of garbage from previous section.
 * @peslen:	length of the PES (Packet Elementary Stream).
 * @list_head:	head for the list of digital TV demux feeds.
 * @index:	a unique index for each feed. Can be used as hardware
 *		pid filter index.
 */
struct dvb_demux_feed {
	union {
		struct dmx_ts_feed ts;
		struct dmx_section_feed sec;
	} feed;

	union {
		dmx_ts_cb ts;
		dmx_section_cb sec;
	} cb;

	struct dvb_demux *demux;
	void *priv;
	enum dvb_dmx_filter_type type;
	enum dvb_dmx_state state;
	u16 pid;

	ktime_t timeout;
	struct dvb_demux_filter *filter;

	enum ts_filter_type ts_type;
	enum dmx_ts_pes pes_type;

	int cc;
	bool pusi_seen;

	u16 peslen;

	struct list_head list_head;
	unsigned int index;
};

/**
 * struct dvb_demux - represents a digital TV demux
 * @dmx:		embedded &struct dmx_demux with demux capabilities
 *			and callbacks.
 * @priv:		private data that can optionally be used by
 *			a DVB driver.
 * @filternum:		maximum amount of DVB filters.
 * @feednum:		maximum amount of DVB feeds.
 * @start_feed:		callback routine to be called in order to start
 *			a DVB feed.
 * @stop_feed:		callback routine to be called in order to stop
 *			a DVB feed.
 * @write_to_decoder:	callback routine to be called if the feed is TS and
 *			it is routed to an A/V decoder, when a new TS packet
 *			is received.
 *			Used only on av7110-av.c.
 * @check_crc32:	callback routine to check CRC. If not initialized,
 *			dvb_demux will use an internal one.
 * @memcopy:		callback routine to memcopy received data.
 *			If not initialized, dvb_demux will default to memcpy().
 * @users:		counter for the number of demux opened file descriptors.
 *			Currently, it is limited to 10 users.
 * @filter:		pointer to &struct dvb_demux_filter.
 * @feed:		pointer to &struct dvb_demux_feed.
 * @frontend_list:	&struct list_head with frontends used by the demux.
 * @pesfilter:		array of &struct dvb_demux_feed with the PES types
 *			that will be filtered.
 * @pids:		list of filtered program IDs.
 * @feed_list:		&struct list_head with feeds.
 * @tsbuf:		temporary buffer used internally to store TS packets.
 * @tsbufp:		temporary buffer index used internally.
 * @mutex:		pointer to &struct mutex used to protect feed set
 *			logic.
 * @lock:		pointer to &spinlock_t, used to protect buffer handling.
 * @cnt_storage:	buffer used for TS/TEI continuity check.
 * @speed_last_time:	&ktime_t used for TS speed check.
 * @speed_pkts_cnt:	packets count used for TS speed check.
 */
struct dvb_demux {
	struct dmx_demux dmx;
	void *priv;
	int filternum;
	int feednum;
	int (*start_feed)(struct dvb_demux_feed *feed);
	int (*stop_feed)(struct dvb_demux_feed *feed);
	int (*write_to_decoder)(struct dvb_demux_feed *feed,
				 const u8 *buf, size_t len);
	u32 (*check_crc32)(struct dvb_demux_feed *feed,
			    const u8 *buf, size_t len);
	void (*memcopy)(struct dvb_demux_feed *feed, u8 *dst,
			 const u8 *src, size_t len);

	int users;
#define MAX_DVB_DEMUX_USERS 10
	struct dvb_demux_filter *filter;
	struct dvb_demux_feed *feed;

	struct list_head frontend_list;

	struct dvb_demux_feed *pesfilter[DMX_PES_OTHER];
	u16 pids[DMX_PES_OTHER];

#define DMX_MAX_PID 0x2000
	struct list_head feed_list;
	u8 tsbuf[204];
	int tsbufp;

	struct mutex mutex;
	spinlock_t lock;

	uint8_t *cnt_storage; /* for TS continuity check */

	ktime_t speed_last_time; /* for TS speed check */
	uint32_t speed_pkts_cnt; /* for TS speed check */

	/* private: used only on av7110 */
	int playing;
	int recording;
};

int dvb_dmx_init(struct dvb_demux *dvbdemux);
void dvb_dmx_release(struct dvb_demux *dvbdemux);
void dvb_dmx_swfilter_packets(struct dvb_demux *dvbdmx, const u8 *buf,
			      size_t count);
void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count);
void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf,
			  size_t count);
void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf,
			  size_t count);

#endif /* _DVB_DEMUX_H_ */